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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219322894d81c5e7fc4fa414c744038ff8e31aa5fb40c7b2f19c18dbbf9b5d0c' 
  AND token = 'a7WaJ/8eyaI1YH7meYxnbjPKVcNrA78HM3DXREk42oY=' 
  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"
    }
  }
}