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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c9cbeec6f95fa0c6c3ff65f7e19010564a076aa443e549f4f0811ff3520b4f' 
  AND token = 'v0w+ff8C83ifcUUIXzUn0p/45Hx9vOvjRmV6ije2M04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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