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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1ad14703824b147ed89772dabeacb19f91739e1d5936f3d77abeac0009985c' 
  AND token = 'AioFRWDK7/SC/RIZwhNpNrOUsRlcM0JpJo2opmP1SJk=' 
  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"
    }
  }
}