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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82393fe6a998453441b59c16755a021def930bd7d090cf9664da08fd490c72f1' 
  AND token = '7KfXKYY2t35YBRp+nGC2LRMeF4Rso/sF7XBOaR/9158=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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