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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4653781676b4b594510013c8c78b77ee341b508324a9e7cfd002b7ec848e76f7' 
  AND token = 'jnEw3q3mwpAmZDGUMRsvEtdJBziakznk7zoGZNQckbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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