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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420d9d749ab1d62866c46580ce6130b45fde2d026b3cebb3910fc4e8e018b6d8' 
  AND token = 'M/ANQyji/tBiIZMj+Z6BI/UcGLvg5qBRGQZV90aZz8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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