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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac671ab25a60c57b199069e5a124cbd31bc43592c3568dd25e47682b0e6eb618' 
  AND token = 'kNry1RdQ5E2IRoD7+gZEiaBUA2KcYyxGsX9MskXhjZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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