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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a62ee982a2281aec3eba9908a730245846bef7475b4829a36684d55f4cb499' 
  AND token = 'eZFXr/yd6pUC6qQw79GaeZONdY3GClwU5RHv5Mdg+zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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