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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a1bea7e921906a717f7129318d53c0f698758c84ee9e92ac89330fc78b655c' 
  AND token = '1v5JX4SxydC8VI6idsSh4bQYKu2EbHpGZ3TV7XfMC5o=' 
  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"
    }
  }
}