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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d09ac07a1f5df45823941c694e8a78bdf4553998d5a0d3e4567f32fbde906d0' 
  AND token = 'GDqs/1NolFMa5e+P/3nfHsD0w9zGVmr91HwleVzKrdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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