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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4bd09a163c94c0895d4d086bf5c9e3817d759ca738798bc57f7e87b8f8b78d1' 
  AND token = 'pc4V9t3ebYtYVCjF7+XP2LkMyGmosKd96vLlUcjkCmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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