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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bafa47715d0a6f9058b39ae23bac6b4400c36c80d62321fef8fda39532e4a1' 
  AND token = 'aidghoLF9afqHgPDzh4BA6zEwtclDuzFaR8iW0Ro3sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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