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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421108e7ea1072d66fde90a391bc729d1cf69c774c8f5713203f7e27815e51e0' 
  AND token = 'ymgzWyVQcM6OjcDuJUkyBQL0Tgw4JnsXeU3KApC7F7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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