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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f6a7371dda4b9e207eadc778d0c7f305fe3cb8bbf11e9e406e4ee51cc95b11' 
  AND token = 'Ds9/12QxNJZ4vs5zqFL/mhqCFRZp9hZcKEdlJbcHoYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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