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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61bbe29b9706a342b43bad78e6bf8df0af074b0d6e1e267d43b2901e629212c' 
  AND token = 'A79q0WQ502nlwdQ/pvfs6buiC1Lfx3yhxOH7g9sRYIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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