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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e50f6296a6270e109dea7904ba496b7ffdc0c87ef5adf3fea74605c23ce741' 
  AND token = 'Eeq9lB4JcAU03fh4oAsyMrBJ6luc7CCzVbVAn2BIf3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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