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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a58caec400c0830de1dd0695d19043b75cec5ed32ccca3fbeb011fe96ce6c3' 
  AND token = 'ISrJ/3mI0PPDO7g4vq3UIbbkwEVu2eSdO9Uk1AnO6uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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