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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d8cc4bf17caeff4c68bda642c14026db264727b10e12107ec548118fe8df25' 
  AND token = '5yM9MwbStrysGA4F/9M31l/sZtS76b96ebZoMBtkVoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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