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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf230bd3b9adb78a3b66b8e3efcd356fb4e9b086fca936bb92b8bf836117bdbc' 
  AND token = 'U5v9lwzSpmcvvOyVxKzL41+nzHpuprDj0Obo4vQIsfE=' 
  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"
    }
  }
}