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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19e4d1edabb27906c7c9d63b4c3e220ede9fdd30e2407f521fe965d65490ea7' 
  AND token = 'Tuy5UEol6mT+ZRPfKqxdmsOB+/qihAeOhZ8niao7GfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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