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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1854e12ba7a2da88847a54abd7d5d213d4ebf81fd62ef9bdc51e9310ddb2f8c9' 
  AND token = 'LJWH7mlUnXnH76glb8ezOnaMRke1EksP4vQP8XZwd/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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