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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24757c23428463be1483603af15bf77968b4c28ce1e2207877fac31b925f7c0b' 
  AND token = '9uxDvrhmFXbHTgjD//klBIFsJwe8cM+teX+O6bLbZc8=' 
  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"
    }
  }
}