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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c6708452a24d763c929d034fa99d4cb82f7bc906e5a0b1d19fee58bbb8a7bc' 
  AND token = '8dfeSAED2FkwgXS0sT8PIfwHMQ7M0MdAiE5SeeeO8RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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