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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29109eec7164b6867924a3709bf9c1870427007c42a932dce3b1be4d875ff39e' 
  AND token = '3VH4FMs7kKoY+RO3I4oIcX3/jR9lBpG7sOJvukuOHkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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