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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a294c9e931f8474798ffa716a2ca7361e34416dcd0875c24047ba2bbe9f26a' 
  AND token = 'y3tP1U6G65BCCg26/9n8wX2ogKMG3A30VCgkzvANJi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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