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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc569ef3913467b52b12bac8150ead5a54a97f8edf8e3a0501a27b3bedda196' 
  AND token = 'AW878h2hkrwQZujDLd62goq3M7/ImWAYOLD7wByXe44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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