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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea2d233d6e49df8c031fc8e86175b645b0b6259d04a69718d2b6ba4ea680ade' 
  AND token = 'FMqQkpq+i9kIZ4g7Jr+ZdCmdAZvt44+86G8VH84WVdY=' 
  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"
    }
  }
}