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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a0bbbfb2e7ef0e4d72116f75285e773d110966543b538daa2cd0a7eb7d392a' 
  AND token = 'xgAQFv+h7Vrfpi2949rH6s27H4vHn82SNzOu9GZMP3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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