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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1696e35a03e318a1986c21c11ce92797beb133a5948e900a8d64a47e5abd2117' 
  AND token = 'j04l4q1oDbPQ44pfN6+9LYAwWVLHVk5xovJOdyd/t2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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