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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8991a369fb1847e124589c8ab95909b63da38c50a3c32f769316d3e527d4da6e' 
  AND token = 'r9F8dxAHWTLw6EtnXP0itDZLHdCLI46/MlivS6sFvGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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