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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbece124cf61bd907b8e4272e24359eb6529337e23b91b6b0d955fd3473bf00' 
  AND token = 'AolEtaGCdZvD6g6RojoaBFx39BCDQdqQC4K7jlz+laA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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