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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1d84f2fc79ed143e2da159d104373d8061645d22b237b7e33bd1c0d4dba700' 
  AND token = 'T2QJMo1CjS957R0LvZjVeyHHYqDs+y4rgDs4WlstOmM=' 
  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"
    }
  }
}