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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa4198b044eca40dc18061ae72b6b9fad47d4b11a79d44e644317d5dbc151ce' 
  AND token = 'xfjCJdC4tCqGpy6WpG1BX7r0F5OsfDa1roKrcppIDLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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