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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ea693b37a52c380bc24d3d3d6321391f19b15d9bf3171ca226e8647ca28fe1' 
  AND token = 'JPWZ052rNVbbVYEL83s9MCAY75kiWWNNSTO3D4D4Rf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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