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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cddf65be64bc6cf6696bbb89626550ce364724a56f98cb8873abe692218c9032' 
  AND token = 'A2TU9R+wmLooY9W/KXRCKMgA1/+JDOj1EPUC5BQeveU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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