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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e168aa38e99d1b2bc6593e2eadb53c629a2c882cd9d86164f0f828799ad15f5a' 
  AND token = 'ESSxj1eExEnhK3zd/6e3vdYbp/AE3OwHW6+7hVRh//A=' 
  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"
    }
  }
}