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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd1517437b4c7081d7a65148a65a74fe6522794f09dc7d6feed513c4d7eed97' 
  AND token = 'o826aDG3Sq5hNTfeF1Zxh2k8D/nmXb0tHTP9o2s2Q0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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