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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29480508b2027509bab5ee00be21e32916515b2022a94e06ffce4aaa56b0a9ca' 
  AND token = 'mz1o8KQhn1Tb4k39htFds3n9RbJQwVZ9LvNOJ09Oil4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}