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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a855e6916028cea9e0ebc3018550083c1ac37a4c333da9cbb8d84b28ddb78a' 
  AND token = '5Bhs821ty95vyhBh93BqkzC30D5S6S2g3/Uqmd0NJ4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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