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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67d62524a0663608024702056df3d697a7a34ccd4fc6b392ea7d3d4029f5fe4' 
  AND token = '1O9vSnnF4w6aYuhfUrHEvHdIEgjYW4cdxPCFW1X484I=' 
  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"
    }
  }
}