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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fca56b1785d0f065366b84bf499d378eb5787426f8dec26fa016fabcccbfa14' 
  AND token = 'HAaR/cljxZL0uXJG2YxdJZ5wUabZt2xOuO41xBVnZ0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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