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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a82c2e57a0c7584f8d675722484737c9c106212247b39680f1c4c41bc8d4ea4' 
  AND token = 'L+CThlwV8Fkycu6bdxeCTIDGREN2eFmwxkxBFVH9ZU4=' 
  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"
    }
  }
}