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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd607ec091bc857e08d913b5450e7eb81530a626c23ab3ee7a0257177d3032e7' 
  AND token = 'J4a8/mPKMUyclCuhiKSetwptjR3WhH/JEa7x8g2gT0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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