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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f69c597f63519c56eb7b1c4d9f4c96d681df5a609a7ae6c491ce4d8fb3d5cd' 
  AND token = 'AxcF+FEVTVbwjqwdJ2fakfX4s4WwpVA1m7tK7kj86g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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