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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb42f70c0c6a50e032e85748329d01f16270a909d1ef6eade70c5bc90e40bcc9' 
  AND token = '/U1WzTNes1T3Gm+U+9qyisdcXzRJbSdVyecoofnBc0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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