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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eac2191f5772d3ada79f8bc8b907191cf5c9d204e75f5e8973a7af8ade008dd' 
  AND token = 'FRBBnIqJxSQTy9T7V7ZKUGjf71LTUu2PIJy4huQYQw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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