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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df8e3ac67848c17678e89ce9afd73288ba18d1b741d140ab373784a92574c01' 
  AND token = 'zHF4PdZhVdD+nDhA7A4tQxEak4YR9IcQFvd0h7iE6cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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