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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f387d73ee40b89c8f86533c275a0daa3775fcfdaf2d75878d96f13e30e05465' 
  AND token = 'H0kq9GLLJFDroz/5AtJtXf4ESc47T2kfkvhpxhH86Q8=' 
  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"
    }
  }
}