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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e888fe6c441c0e24468d038550ef09587aa788c315f05021e5682b03c12e4fc' 
  AND token = 'lSVgoR0UdcZFZWxukBIRYs1E7YHzTVGsOUA1N10T1es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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