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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c18bddd3b8864690fff6974d32e1fd69b88c5d8981caaf4f22a296f9b355546' 
  AND token = 'ebp1BtAaLc2qL1nOBLwvQTFw7T6fcj9HWiyRokmB9pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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