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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e324c96df23f8d95c31d67f02fac78a36361ba9c3c2a2c461c775ade4d02cf82' 
  AND token = 'bPlw3muYkcgVc41K4JYRseRbrfQIk4GLWMoipWLu2hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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