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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd755d6515c631925c343b920fc200394f8a7cec1e7e3c13cb11e5df0a9ed4a46' 
  AND token = 'sb0duB7JKV6R7OMy6kh42CBFKSwTQ0uODcNyIJvV+Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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