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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86e1caa6870b1f216b448fa09711d4aee1037b5ae88e92291bd34bae0cda3b9' 
  AND token = 'TSJ2c7Rs/Q02sSlBBhkwdsicucMaEN0h/Rto8DJnYSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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