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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f55467726b46f18777e974eb6d0ed7da6754e1e4986f9584eb84f9476c83b02' 
  AND token = 'Z+OP4X2u2u2MklWZ1n8xEq9avt1uzNFpkp2UFGWtszM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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