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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96aa9266db59aacb2872ec2e9f77e572b32fef703a94dcdcffbd0ef2ac3b28a2' 
  AND token = 'n5OyxX09lC7mXa285zaoHMuevwm7c29PKFY9I3b+aQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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