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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a896e408ff241d9e33039a5f8851b3c8cb48e90aeb5498341cb5f18cd88d2c2' 
  AND token = 'rpiy77rIpPzaTReIc2FM1reYKMDMswB6zHfITSE88Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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