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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b7f5302189120120e6204e69ea4232f3d65f50c7a3a70ee42d43f22a4676fb' 
  AND token = '4t5JVn3EwUrAKKfEcQRmWSi/rX66SFefbpRB1cz3rXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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