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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef7880a71250af580b489c513d596b6dd11ff3e15e5138e521e3db9fa70ae9b' 
  AND token = 'iYGSS+MF03pD3Ep3tsEpiSA3Gk/HzVliPCab6hWO3HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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