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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b057a28183d0b1d5ef01bc9ea5d11ec5822f54735b59d6454d060e4a23475e3' 
  AND token = 'TpaHQP5Az9rOTa+mnxy4E+A9EDfKolR1IS/tUWMv4Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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