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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa4394176f00df2a0f48a1c4beddc27cf519ad5e8703a0755ad2f7f1c772301' 
  AND token = 'bF78T0ADnle+6ujCLL1uyxdAc1Jsc1MMi9Wnquu/BhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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