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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e51f5218b93fd5751098db510fe47ce9efa0144adb79298f0bdd29afd7ae712' 
  AND token = '7MvwKd8INKDGcaEvh1ARGv1QMi0okj2H3fhwidbxA8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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